Gas baking method and device for aluminium electrolysis cell

Abstract

The invention discloses a gas baking method and device for an aluminium electrolysis cell. The method comprises the following steps of: heating a cell cavity to 900 DEG C, and directly pouring electrolyte into the cell cavity for starting; in the heating process of the cell cavity, dividing the cell cavity of the electrolysis cell into a plurality of areas, respectively arranging controlled burners at multiple spots of each area, wherein the controlled burners are uniformly distributed and are arranged under the bottom palm of the positive pole of the big surface of the aluminium electrolysis cell in a staggering mode, and controlled draught flues are respectively arranged in the central joint of the cell cavity and at multiple spots of the side surface of the cell cavity so as to reduce the temperature difference between all the areas; and in the baking process, controlling the ratio of the gas to the air to be less than 1:3, and preventing carbon blocks from oxidizing in a controlled oxygen deprivation combustion mode. The device comprises the plurality of controlled special-shaped burners and the controlled draught flues, wherein the controlled special-shaped burners are uniformly distributed and are arranged under the bottom palm of the positive pole of the big surface of the electrolysis cell in a staggering mode, and the controlled draught flues are arranged in the central joint of the cell cavity and at the multiple spots of the side surface of the cell cavity. The invention is beneficial to the uniform heating of the cell cavity, reducing of the temperature difference between all areas and the oxidation of the carbon blocks in the baking process.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis technology, in particular to a method and device for gas roasting an aluminum electrolysis cell. Background technique [0002] At present, the special-shaped cathodes of aluminum electrolytic cells are vigorously promoted, and the conventional coke particle roasting in the past is no longer suitable for the roasting start of special-shaped cathode electrolytic cells. The gas roasting method is widely used for its advantages of uniform temperature distribution, controllable heating rate, small vertical temperature gradient, no coke particles in the start-up process, and balanced current distribution. The technology of gas roasting used in foreign large-scale aluminum electrolytic cells cannot The domestic application is not only limited by the complex equipment and process, technical confidentiality, etc., but also the structure is not suitable for aluminum electrolytic cells in our c...

AI Technical Summary

Problems solved by technology

The gas roasting method is widely used for its advantages of uniform temperature distribution, controllable heating rate, small vertical temperature gradient, no coke particles in the start-up process, and balanced current distribution. The technology of gas roasting used in foreign large-scale aluminum electrolytic cells cannot Domestic application is not only restricted by its complex equipment and process, technical confidentiality, etc., but also the structure is not suitable for aluminum electrolytic cells in my country

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